Dental casting machine



Au 14, 1923. mks? S. L. JEFFERIE$ DENTAL CASTING MAGHIE Q 4 Wmwt 1 FiledJan. 1922 all W/TNESSES o i INVENTOR 5L. Je ffn s,

ATTORNEYS Au 114, 1923. HAMfiS? S. L. JEFFERIES DENTAL CASTING MACHI NEFiled Jan. 5,1922 4 Sheets-Sheet 2 J 5 I "4 2 is ga I A TTOR/VEYS Au 14;923. I

Emma? s. JEFFERIES DENTAL CASTING MACHINE Fil'ed Jan. 5

192g 4 Sheets-Sheet 3 IIVI/ENTOR WITNESSES A TTOR/VEYS AQQM, 1923.1,44%?

' S. L. JEFFERIES DENTAL CASTING MACHINE Filed Jan. 5, 1922 4Sheets-Sheet 4 3. LJejjeraQs A TTOR/VEYS Patented Aug. 14, 11923.

pants at Lddehtihi SAMUEL LIONEL JEFFERIES, 01F GAFFNEY, SOUTHAIEtOLINA.

DENTAL CASTING MACHINE.

Application filed January 5, 1922. Serial No. 527,184.

To all whom it may co nce m:

Be it known that I, SAMUEL LIONEL Jar- FERIES, a citizen of the UnitedStates, and a resident of Gafi'ney, in the county of Chero kee and Stateof South Carolina, have invented certain new and useful Improvements inDental Casting Machines, of which the following is a specification.

This invention relates to a dental casting machine.

The object of the invention i to provide a machine or device adapted forcasting teeth from gold, porcelain or other fusible material in a highlyeiiicient and expeditious manner.

It is also an important object of the invention that the device beextremely simple in construction and eas to manipulate.

Other objects and o jccts relating to details of construction,combination and arran ment of part will hereinafter appear in t edetailed description to follow.

The invention is illustrated by way of example in the accompanyingrawings, in which z- Figure 1 is a view in side elevation of a form ofthe present dental casting machine and with parts broken away and shownin section to more clearl illustrate the same.

Figure 2 is a top p an view of the same.

Figure 3 is a view similar to Figure 1 but showing a slightly modifiedform of the invention.

Figure 4 is a detail plan view of the crucible table shown in Figures 1and 3.

Figure 5 is a view imilar to Figure 4 but showing a slightly modifiedform of the crucible table.

Figures 6 and 7 are views similar to Figures 4 and 5 and showing twoadditional modifications of crucible table.

Figures 8, 9 and 10 are vertical sectional views of different forms ofcasting rings.

Figure 11 is a side elevation of a further modified form of castingring.

Figure 12 is a side elevation of a casting ring of the type shown inFigure 9-and also illustrating the same within a novel form of receiverpan.

Figure 13 is a bottom lan view of the receiving pan shown in Figure 12.

Figures 14 and 15 are views similar to Figures 1 and 2 respectively, butshowing the modification of the invention.

Like reference numerals refer to the same parts throughout the differentviews.

Referring to the drawings more particularly, B indicates generally thebase of the casting machine which may be of any preferred shape,preferably rectangularly as shown, and extending upwardly from a pointadjacent the one end of the base is a post '10. The post 10 ispreferably square in cross section and the greater portion thereofhollow and within the post there is slidable an extension 11, saidextension being square in cross sectionand the interior of the post 10bein adapted to slidingly receive the same an also hold the extension 11against turning movement. Threaded through the upper end of the post 10is a set screw 12 whereby the extension 11 may be adjustably held withrelation to the post 10. The upper end of the extension 11 terminates inan enlargement 13 which is bifurcated at its free end and provided witha. bolt 14, said bolt pivoting or fulcruming a lever bar generallyindicated by the reference numeral 15. 'A free end of the lever bar isconnected to the one end of acoil spring 16 while the other end of thecoil spring is connected to a hook 17 made secure to the base B. Alsothe lever bar 15 is formed with an enlargement occuring intermediate theends of the same as shown, and the pur ose of which will later becomeapparent. 'Fhe lever bar 15 is also formed with a rounded end portion 19to serve as a handle therefor. The spring 18 is adapted to normally holdthe handle end 19 of the lever bar 15 in raised position with respect toits end connected to the sprin 16.

Adjacent the other end of the ase B with respect to the post 10 thereextends upwardly a pair of supporting rods 20, said rods being threadedat their upper ends through what may be termed a crucible tablegenerally indicated by the reference character T. Also it should benoted that the lower ends of the rods 20 are turnably supported by theplatform .13 and their upper ends are threaded so that the crucibletable T may be lowered or raised. The rods 20 support the one end of thecrucible table T and as shown one is located adjacent each side thereofwhile the post 10 supports the other end of the crucible table T. Theend of the crucible'table associated with the post 10 is formed with asuitable recess through which the post 10 may pass, said recess beingcentrally of the one end of the table and upon the post there is carrieda collar 21 which is positioned beneath the table T and adjustably heldby a set screw 22 so that this end of the table may be raised orlowered, the same as the other end thereof in the mannerpreviouslydcscribed.

At a point intermediate the ends of the crucible tableT there is formeda suitable recess in which there is positioned'a grid generallyindicated by the reference numeral 23, said grid as shown in Figures 1and 4, comprising a ring 24 having formed therewith radial plates whichextend from its inner periphery to a point in close proximity to thecenter of the ring. The ring 23 is preferably slightly greater inthickness than the crucible table T and also the upper edge of the ringslightly projects above the radial plates \Vithin the ring 24 there isfitted a cylindrical crucible 26 and about the lower end of the crucible26 is a sheeting of asbestos 27, said asbestos being. secured to thetable by means of rivets or the like as at 28.

Within the crucible 26 there is positioned suitable sectional molds 28which are adapted to form a casting cavity as at 29, said casting'cavitycommunicating with the upper surface of the molds through an orifice 30;It will also be observed that .the upper surface of the molds 28' areslightly dished as indicated at 31.

A cap 32 is provided which is adapted to fit upon the cylindricalcrucible 26 and form a tight closure therefor. The head portion of thecap 32 is provided with a cylindrical extension In the form of theinvention shown in Figure lthis cylindrical extension is partially solidand is fitted in a suitable recess formed transversely of the enlarge:ment 18 of the lever bar 15 and adapted to retain the cap 32 in thisposition.

Referring to Figure 3 it will be seen that the cylindrical extension 33is hollow to provide a passage 34 which communicates with the interiorof the cap 32. Also it will be seen that a plug generally indicated bythe reference numeral 35 is extended into the passage 34, said plugterminating at its outer end in a stop-cock 36 having formed therewith apressure gage 37. The stopcock 36 is in turn connected to a flexiblehose 38 and valve 39, and said valve 39 with a tank 40 adapted forretaining air under pressure.

the crucible table T is formed at its one end with a reduced extension43 through which the post 10 passes, and said extension also carries aset screw 44 by which the extension 11 is adj ustably held within thepost 10. Also in this instance the grid is generally indicated at 45 andis of slightly different construction than specifically shown in Figure4, said grid comprising a ring (not shown) which is formed wit-h thespokes 46.

In the operation of the device shown in Figures 1- and 2, the gold orother material which is to be used in forming a tooth is to be placed onthe mold in the dished surface 31 and then the heating thereof begins.It is of course assumed that the lever bar 15 is in its raised positionand so held by the spring 16. The gold or other material will melt anddrain into the cavity 29. After the cavity 29 has become filled'then Wetclosing the upper end of the crucible 26;

This wet paper will force the fused metal or porcelain into the cavity29 so that the tooth formed wiil be free of imprisoned air or fissures.

. In case that'a. different sized mold or cru cible is used then thecrucible tables T may be adjusted to suit the same by manipulating thebolts 20 for raising or lowering the one end of the table and adjustingthe collar 21 for raising or lowering the. other end of the table. Alsoif necessary the distance of the lever bar 15 above the crucible may beadjusted by means of the set screw 12.

I In the use and operation of the device shown in Figure 3 the operationis carried on as described for Figures 1 and 2 up to the point when itis desired to force the fused metal or porcelain within the mold cavity29. The cap 32 is brought into position as shown in Figure 3 and thenthe stopcock 36 is opened by the links 35' and 36 and air is permittedto enter the top of the cap with the result that the same air will forcethe fused metal into the mold cavity and eliminate the possibility offissures or the like in the tooth formed. Also by this arrangement thepressure of air may be ascertained by the gage 37 and the air may' beshut off and turned on from the tank 40 by the valve 39.

Referring to Figures 6 and 7 the table, in each instance, generallyindicated by the letter T consists in a section of sheet iron preferablyrectangular in shape. In Figure 6 the table is shown as being formedwith a circular opening centrally thereof as at 47 and the pair ofenlarged arcuate shaped recesses 48. In Figure 7 a similar central andcircular opening 49 is formed in the table T recast? I and a pluralityof openings 50 are positioned about the opening 49 preferably in themanner shown. In Figures 8, 9 and'10 the casting ring, in each instanceis gener ally indicated by the reference numeral 51, and as shown,consists in a hollow shell tapering toward its lower end. In Figure 8the shell is shown as formed with a rib 52 adjacent its upper end, whilein Figure 9 a similar rib 53 is shown as being formed intermediate theends of the shell andupon the exterior surface thereof. In Figure 10 thesame rib as at 54 is shown as being positioned adjacent the lower end ofthe shell. Also in Figure 11 a similar casting ring 51 is shown and inthis instance intermediate the ends of the ring there is formed upon theexterior surface thereof a plurality of circumferentially spaced lugs55.

As is obviouseither of the casting rings shownjin Figures 8 to 11inclusive may be used upon either of the crucible tables shown inFigures 6 and 7 by positioning the same in the openings 47 and 49respectively. The purpose of positioning the supporting rib for eachcasting ring differently is that they may be inserted within theopenings 19 or 17 of the crucible tables at different depths.

In Figure 12 there is shown a. casting ring of the type shown in Figure9 and said ring being seated in a receiver pan generally indicated bythe reference character 56. This receiving pan 56 tapers toward itslower end and is formed at its upper end with an outwardly projectingflange 57 upon which the rib 53 of the casting ring may seat. The bottom58 of the receiver pan 56 is formed with a plurality of circularopenings 59 in order that the flame may pass upwardly therethrough andwithin the casting ring seated therein.

Also it may bementioned that the opening 48 shown in the table 6 is forthe purpose of permitting the flame to pass ,upwardly and about thecasting ring and about the openin 50 shown in the Figure 7.

tet'erring to Figures 14 and 15, the base B in this instance, has twoposts 10' extending upwardly therefrom which corresponds in constructionto the post 10 shown in Figures 1 and 3, that is, each post is hollowand provided with an extension 13, said extension being slidable withinthe upper end of the associated post. Also each post is provided with aset screw 12 whereby the extension 13 may be adjustably secured. Thetable T is supported at its one end in the same manner, as in Figures 1andl3, that is, by the adjustable rods 20 and at its other end betweenthe pair of posts 10. The table T has formed adjacent one end a pair oflugs 9. one for each of the posts 10, and each lug being formed with anopening permitting the associated post 10 to slide therethrough.

Also each lug has threaded therethrough a set screw 8 whereby the table7 may be adjustably held at its one end by the post 10'. Between theupper ends of the post 10 there is turnably supported a cross head 7,and through said cross head 7 there extends the forward end of the lever15 whereby to fulcrum said lever. The lever 15 isconnected with the baseB through the means of a coil spring 6, said coil spring being connectedat its lower end or to the base by the means of a hook 5. Theconstruction of the dental casting machine shown in these two figures,namely 14 and 15, is otherwise the same as shown in Figures 1 and 2, andit is thought that the operation of this modified form of invention willbe clearly obvious without detailed description thereof.

While I have shown and described the preferred form of my invention, Iwish it to be understood that I am aware of the fact that theconstruction, combination and arrangement of parts may be changed bythoseskilled in the art without departing from the spirit of theinvention as indicated. by the appended claims.

What I claim is:

1. In a device of the character described comprising in combination, abase, a table supported by said base in spaced relation thereabove, acrucible supported by said table, means for applying a melting heat tosaid crucible, molds within said crucible whereby the tooth may be cast,a post extendin upwardly from said base, a lever bar in crumed by saidpost, a cap carried by said lever bar adapted to be brought to form aclosure for said crucible when said handle bar is brought in properposition, means connected with said handle bar to yieldingly hold thesame so that the cap is normally dis osed above said crucible, and

means where y the table may be adjustably raised and lowered.

2. In combination, a crucible table of the character described,comprising a sheeting of metal having formed centrally thereof acircular opening, a receiving pan cylindrical in shape and taperingtoward its lower end adapted to slide within said openin a flange formedabout the upper end of said receiving pan and adapted to engage thecrucible ta le and seating the receiving pan, and a casting ring adaptedto fit within said receiving pan.

3. In combination, a crucible table of the character described,comprising a sheeting of metal having formed centrally thereof acircular opening, a receiving pan cylindrical in shape and taperingtoward its lower and adapted to slide within said opening, a flangeformed about the upper end of said receiving pan and adapted to engagethe crucible table and seating the cylindrical pan, a casting ringadapted to fit within post extending upward said receiving pan, andmeans formed upon the exterior of said casting ring adapted to supportthe same in spaced relation with the lower end of said receiving pan.

4. In a dental castin machine, a base, a

fy from the base adjacent the one end thereof, a pair of rods extendingupwardly adjacent the other end of said base, said rods being adapted tobe rotated for raisin and lowering the same, a table supportef betweensaid rods and post, said table being adjustably secured to the postwhereby 1t may be raised and lowered, a lever bar fulcrumed upon saidpost, a crucible supported by said table carrying a mold, and a capcarried by said lever bar and adapted to be brought into position forengaging said crucible and mold.

5. In a dental casting machine, a base, a post extending u Wardly fromthe base adjacent the one en thereof, a pair of rods extending upwardlyadjacent the other end of said base, said rods being adapted to berotated for raising and lowering thereof,

a table supported between said rods and post and said table beingadjustably secured to the post whereby it may be raised and lowered, alever bar fulcrumed upon said post, a crucible supported by said tablecarrying a mold, a cap carried b said lever bar and adapted to bebrought into position for engaging said crucible and mold, a valvecarried by said lever bar whereby compressed air may be injected intothe mold upon the cap carried by the lever bar being lowered thereon,and means for automatically opening the said valve when the lever bar isbrought to its lowered position.

6. In a dental casting machine, a base, a post extending upwardly fromthe base adjacent the oneend thereof, a pair of rods extending upwardlyadjacent the other end of said base, said rods being adapted to berotated for raising and lowering thereof, a table supported between saidrods and 0st and said table being adjusta-bly secure to the post wherebyit may be raised and lowered, a lever bar fulcrumed upon said post, acrucible supported by said table carryin a mold, a cap carried by saidlever bar an adapted to be brought into position for engaging saidcrucible and mold, a valve carried by said lever bar whereby compressedair may be injected into the mold upon the cap carried by the'lever barbeing lowered thereon, means-for automatically opening the said valvewhen the lever bar is brought to its lowered position, and a linkconnection between the post and valve whereby the valve will beautomatically opened upon the lever bar assuming its lowered position.

7. Incombination, a crucible table of the character described,consisting in a section of metal sheeting having formed centrallythereof an opening, other openings formed about the first named opening,a casting ring adapted to slidingly project into said opening, and meanson said castingring adapted to seat the same upon said crucible table.

SAMUEL LIONEL JEFFERIES.

